Advanced Multi-Frequency Generation Technology for Transformer Insulation Testing: The ZXBP Series

In the power industry, insulation integrity testing for transformers and instrument transformers is critical to ensure compliance with national standards and operational reliability. Among these tests, the induced withstand voltage test for inter-turn, layer, section, and phase insulation (longitudinal insulation) is particularly demanding. Traditional methods often require complex setups and high-capacity power sources. The ZXBP Series Electronic Multi-Frequency Generator addresses these challenges by providing a compact, versatile, and efficient solution for longitudinal insulation testing. This article explores its technical features, specifications, and applications for power equipment testing.

Key Technical Features

1.Multi-Frequency Output Flexibility
Unlike conventional triple-frequency generators, the ZXBP series supports 1×, 2×, 3×, and 4× frequency outputs (50–200 Hz). This enables precise compliance with test standards for transformers and instrument transformers under varying voltage and frequency conditions.

2.Compact Design with High Power Density
Utilizing advanced power electronics, the ZXBP achieves high power output (up to 20 kVA) in a lightweight, portable form factor. This design minimizes on-site space requirements and simplifies transportation, particularly for field testing.

3.Low Waveform Distortion
The device generates sinusoidal waveforms with <3% total harmonic distortion (THD), ensuring accurate test results and minimizing interference with measurement systems.

4.Broad Input Voltage Compatibility
Compatible with both three-phase 380V±10% and single-phase 220V inputs (via A-C terminals). Note: Single-phase operation reduces available capacity by approximately 50%.

5.Scalable Voltage Output
Base output ranges from 0–400V AC, extendable via external step-up transformers to meet high-voltage testing requirements (e.g., 10 kV or higher for large transformers).

Technical Specifications

Applications in Power Systems

1.Transformer Longitudinal Insulation Testing
Generates high-frequency voltages to simulate stress on inter-turn and inter-layer insulation, identifying weaknesses without damaging the core.

2.Instrument Transformer (CT/PT) Testing
Supports frequency-multiplied voltage tests for metering and protection accuracy validation.

3.On-Site Commissioning & Maintenance
Portable design enables efficient field testing of grid-connected equipment, reducing downtime.

Advantages Over Traditional Methods

1.Reduced Dependency on High-Capacity Power Sources: By generating required frequencies internally, the ZXBP minimizes input power demands compared to direct grid-fed test setups.

2.Enhanced Test Precision: Programmable frequency selection and clean waveforms improve repeatability and diagnostic accuracy.

3.Operational Efficiency: Simplified wiring and automated frequency control reduce setup time by 40–60% compared to electromechanical multi-frequency systems.

The ZXBP Series Electronic Multi-Frequency Generator represents a significant advancement in insulation testing technology. Its combination of portability, multi-frequency flexibility, and high-fidelity output makes it indispensable for power utilities, transformer manufacturers, and testing laboratories. By streamlining critical tests while ensuring compliance with IEC and GB standards, this device enhances both operational safety and lifecycle management of high-voltage equipment.

For technical teams, mastering the ZXBP’s capabilities can significantly improve testing workflows, reduce costs, and mitigate risks associated with insulation failures in power systems.

GDZX is a manufacturer of power testing equipment, offering a wide range of product categories with comprehensive models and providing professional technical support. Contact: +86-17396104357.Website: https://www.highvoltage-testequipment.com/